All Box hub sets that with axle diameters of 15mm and up are engineered and crafted using our Oversized Technology. For steering stiffness we follow the load paths down the handlebars, through the stem, headset, and eventually to the fork-to-hub interface. To transfer as much of that load from fork to axle we’ve shaped the dropout for substantially more capture of the now oversized 20mm axle. Its the same fundamentals at the rear for pedaling stiffness where we also deploy more substantial diameters to inhibit axle deflection. On both ends the added surface area begs for upsized bearings and consequently we are gifted with materially more contact surface. You’ll put more power to the ground out back and up front you’ll feel in control.When combined with Box’s other Oversized components, you’ll experience heightened responsiveness and reduced latency. Key differences:The Box One line tunes material distribution to a higher level than Box Two through its CNC process. Aluminum can more accurately be removed from low stress areas to reinforce intersections. Box One’s unique and hard chromoly one-piece driver accepts various (10,15,20mm) diameter oversized axles at the rear while the front is set at 20mm.